The picnics were a good idea when WoC was new, because those FPs went early in the day (like RSR does now) and the picnic allowed people to still get into the reserved viewing area without lining up so early for a FP. But now you can get show FPs even late in the day, so the picnic no longer offered an advantage.
I never did a picnic but had read here from multiple sources that the food was actually pretty good for the price, too!